﻿/************************************************************************

   Extended Silverlight Toolkit

   Copyright (C) 2010-2012 Xceed Software Inc.

   This program is provided to you under the terms of the Microsoft Public
   License (Ms-PL) as published at http://extendedsilverlight.codeplex.com/license

   Please purchase a commercial version of this toolkit if you are using
   it in a commercial product. The commercial versions support the project,
   and also include more features for each control, priority support,
   source code, updates, removed watermark, and a proprietary license.

   Visit http://xceed.com and follow @datagrid on Twitter.

  **********************************************************************/

using System;

namespace Xceed.Silverlight.Data
{
  internal sealed class DataPathDataHelper<TChildElement> : ContextualParentDataHelper<DataPath, RawDataItem, TChildElement>
  {
    #region Constructor

    internal DataPathDataHelper( IContextualDataHelper<TChildElement, RawDataItem> childDataHelper )
      : base( childDataHelper )
    {
    }

    #endregion

    public override DataPath Convert( DataSourceContext context, RawDataItem value )
    {
      if( value == null )
        throw new ArgumentNullException( "value" );

      return new DataPath( value );
    }

    public override RawDataItem ConvertBack( DataSourceContext context, DataPath value )
    {
      if( value == null )
        throw new ArgumentNullException( "value" );

      if( value.Depth != 1 )
        throw new DataInternalException( "Invalid DataPath." );

      return ( RawDataItem )value[ 0 ];
    }
  }
}
